Gabriel a



( No-Model.) I V G. A. BOBRIOK.

ADJUSTABLE SUPPORT FOR FURNITURE,

Patented June 30, 1896,

2 @162 g 61 55 a1 6 6 Few UNITED STATES PATE T v OFFICE.

GABRIEL A. BOBRICK, OF BOSTON, MASSACHUSETTS;

ADJ USTABLE su PPORT 'oRQ FU RNITU R srncmoarron forming part of Letters Patent No. 563,010, dated June 30, 1896. Application filed January 16, 1895- serial No. 535390. (No model) To all whom it may concern: v

Be it known that 1, GABRIEL A. BOBRICK,

of Boston, county of Suffolk, State'of Massa chusetts, have invented an Improvement in -Adjustable Supports for Furniture, of which the following description, in connection with;

Thisfinvention has for its object the pro- I duction of an adjustable support particularly adapted for use in connection with-school desks and seats, whereby vertical adjustment of the supported object may be accomplished easily and rapidly and with safetyto the operator, the support being-held firmly in -adjustedposition by a simple'and strong construction;

In accordance therewith my invention consists in a fixed member or standard and a 00- operating vertically-adjustable member embodying various'details of 'constructionhereinafter described, and particularly pointed out in the claim. v

Figure 1, in sideelevation and partially broken out, represents a sufficient portion of the fixed and movable members of an adj ustable support' embodying my invention. Fig, 2 is a transverse. section thereof on the line w as. Fig. 3 is a perspective view, on a smaller scale and partly broken out, of the head and upper end of the fixed 'member or standard. Fig. 4:, in section and elevation, is a modification of my invention; and Fig. 5 is atransverse sectional view on the line y y, Fig. 4.

Referring to the drawings, Figs. 1 to 3, the fixed member of the support is shown as a bifurcated standard a, preferably of cast-iron, having an open top or head a, secured at its base (not 'shown) to the floor in well-known manner. The interior of the head a." is made at one end to present two separated conver- A bar I), conslderably smaller 1n cross-section than the opening in the head a, formsthe movable member of the support, and it is attached at its upper end in usual manner to a desk or chair; faces '11, having transverse serrations or notches, are formed at oneend'of and extending substantially the length of said movable member, said faces being adapted' to rest against the similarly-converged bearingsa the notches or serrations on the bearings engaging those on the faces b"and' positively preventing longitudinal movement ofx-the 1 movable bar I) during such engagement;

(Not shown.) Converging.

. The clamping-screw a is so located as to I bear upon the opposite plane side b of the barb about midway betweenthe extremities of the long bearings a to .firmly maintain such.

engagement, and by reason of the notched bearings and cooperating faces it is only-nec-,

,essary to set the screw tight. enoughto prevent play between the parts.

A toe b is formed on the sideb? of the mov able member-toenter one orthe other of the the notches a on the standard and rest .on

horizontal face thereof.

When adjusted, the parts of the support are in the position shown in Figs..1 and 2,

the chair'or desk the screw a is; loosened suf-,

'ficient-ly 'to permit the top of the bar b to be moved by the operator in the direction of the arrow, Fig. 1, to thereby withdrawthe toe b from its notch, after'whi'ch' the bar can be raised or lowered to the desired height, the

weight of the desk or chair tending to turn the bar 6 on the screw a? as a fulcrum assoon as released by the operator to thereby bring of, said toe and cooperating notchesforming a detent for the movable member. This pro vents accidental dropping of the bar 6 and its attached piece of furniture, and overcomes any liability to injure the hands of the oper in the modificationshown in Figs. 4 and- '5", the head c'of the standa'rdis provided with] 9 the toe 75 into engagement with another notch converging transverselynotchedbearingsc,

ber cl between two converging and transversely notched or serrated faces d Screws 0 extended through the opposite,

side of the head, bear upon the side (Z of the bar (I lower than the shoulder 0 and main-' tain the converging faces and bearings in engagement. When the screws are loosened for purposes of adjustment, the shoulder o prevents accidental falling of the member cl.

From the foregoing description, taken in connection vwith the drawings, it will be seen that in. adjusting the support the movable member must "be positively moved by the operator befor'eit can be raised or lowered, the

'detentpreventing the movable member from falling accidentally.

I claim In an adjustable support for furniture, a fixed standard having an open head, long con verging vertical bearings within andat one end of said head and transversely serrated,

and a clamping-screw in the head, opposite said bearings, combined with a member longitudinally movable in said head, havinglateral play therein at times, and having transversely serrated converging faces on one side thereof and extending substantially its length, to engage and be held against said bearings when lateral play of said member is prevented by the clamping-screw, and an independentdetent, consisting of a series of notches on one, and a cooperating projection on the other memberyto prevent accidental falling of the movable member when unclamped, rocking of the movable member re leasing the detent, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GABRIEL A. BOBRICK. \Vitnesses AUGUSTA E. DEAN, JOHN 0.,EDWARDS. 

